Electromagnetic Waves NEET PYQs (1989–2026)

Solved Electromagnetic Waves PYQs

3 recent questions with answers. The full set of 53 is free to practise.

1. NEET 2026EasyElectromagnetic Waves
   Q1

   An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant, ${ϵ}_r=9$, has the electric field, $E_x=E_0\sin \left(kz-2\pi \times 10^{6}t\right)$ Vm^-1 where $E_0$ is the amplitude and $k$ is the wave vector. Among the following options, the incorrect choice is:

   • AThe speed of the electromagnetic wave inside the medium
     
     is $10^8{ms}^{-1}$
   • BThe wavelength of the electromagnetic wave inside the
     
     medium is $300m$
   • CThe magnetic field is given by the relation
     
     $B_y=\frac{B_0}{\nu }\sin \left(kz-2\pi \times 10^{6}t\right)$ where $\nu$ is
     
     the speed of the electromagnetic wave inside the medium
   • DThe direction of propagation of the electromagnetic
     
     wave is along $+z$

   Show answer & solution

   Correct answer: (B)

   $$\nu =\frac{c}{\sqrt{{ϵ}_r}}=\frac{3\times 10^8}{3}=10^8$$
   
   m/s. (A is correct)
   
   $\omega =2\pi \times 10^6$ rad/s.
   
   $$k=\frac{\omega }{\nu }=\frac{2\pi \times 10^6}{10^8}=2\pi \times 10^{-2}$$
   
   m^-1.
   
   $\lambda =\frac{2\pi }{k}=\frac{2\pi }{2\pi \times 10^{-2}}=100$ m.
2. NEET 2024MediumElectromagnetic Spectrum
   Q2

   The electromagnetic radiation which has the smallest wavelength are [NEET 2024 Re]

   • AX-rays
   • BGamma rays
   • CUltraviolet rays
   • DMicrowaves

   Show answer & solution

   Correct answer: (B)

   Among the given options, $\gamma$-rays has the smallest wavelength.
3. NEET 2023HardMaxwell equation and Displacement Current
   Q3

   An ac source is connected to a capacitor $C$. Due to decrease in its operating frequency
   
   [NEET 2023]

   • ADisplacement current increases
   • BDisplacement current decreases
   • CCapacitive reactance remains constant
   • DCapacitive reactance decreases

   Show answer & solution

   Correct answer: (B)

   Solution:
   $$X_C=\frac{1}{\omega C}$$Since $\omega$ decreasing Xc will increases hence current will decreases also conduction current $=$ displacement current
   Therefore displacement current will decrease.

Topic-wise question count

Where NEET has asked from Electromagnetic Waves, most frequent first.

• Electromagnetic Waves34
• Electromagnetic Spectrum15
• Maxwell equation and Displacement Current4

Year-wise Electromagnetic Waves questions in NEET

Number of questions from this chapter in each year's paper(s).